/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/IntrinsicTriangulationMesh.h
Given edge EID connects UpdateVID and StartVID, this update the SurfacePosition of the vertex UpdateVID by tracing the edge EID a distance TraceDistance from StartVID.
double UpdateVertexByEdgeTrace ( const int32 UpdateVID, const int32 StartVID, const double TracePolarDir, const double TraceDistance )